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DI-22
                                                    DIAGNOSTICS       -   ENGINE
                                                                                                                                  DI6UV-05


CIRCUIT INSPECTION

     DTC                P0100                Mass Air Flow Circuit Malfunction

CIRCUIT DESCRIPTION
The mass air flow meter uses a platinum hot wire. The hot wire air flow meter consists of a platinum hot wire,
thermistor and a control circuit installed in a plastic housing. The hot wire air flow meter works on the principle
that the hot wire and thermistor located in the intake air bypass of the housing detect any changes in the
intake air temp.
The hot wire is maintained at the set temp. by controlling the current flow through the hot wire. This current
flow is then measured as the output voltage of the air flow meter.
The circuit is constructed so that the platinum hot wire and thermistor provide a bridge circuit,with the power
transistor controlled so that the potential of A and B remains equal to maintain the set temp.


                                 B+
               Thermister
                                          Power Transister


                                          Platinum Hot wire



                             A                  B
                                                        Output
                                                        Voltage



  FI6929
  S05741                                                                                                                           A06106




   DTC No.                        DTC Detecting Condition                                                  Trouble Area
                                                                                 S Open or short in mass air flow meter circuit
               Open or short in mass air flow meter circuit with more than 3
    P0100                                                                        S Mass air flow meter
               sec. engine speed 4,000 rpm or less
                                                                                 S ECM



If the ECM detects DTC "P0100" it operates the fail-safe function, keeping the ignition timing and injection
volume constant and making it possible to drive the vehicle.
HINT:
After confirming DTC P0100 use the OBD II scan tool or TOYOTA hand-held tester to confirm the mass air
flow ratio from "CURRENT DATA".
             Mass Air Flow Value (gm/sec.)                                                       Malfunction
                                                            S Mass air flow meter power source circuit open
                          0.0
                                                            S VG circuit open or short

                    271.0 or more                           S E2G circuit open




 2002 ECHO (RM884U)

                                                                                    Author :                     Date :             192
                                                                                                                          DI-23
                                                  DIAGNOSTICS        -    ENGINE

WIRING DIAGRAM
              I10              Instrument Panel J/B
              Ignition Switch
                                  6           3
            W-R            B-R
                                 1O          1A
               5 AM2 IG2 6
                                                             B-R
       1O 1 Instrument                                                                                              ECM
            Panel J/B             B-Y


       1A 7
            W-R                                                          Engine
                                                   1         1
        1             1                                                  Room
   2                      2                            1         5       R/B No. 1
                              Engine
                                          EFI
             AM2          EFI Room
                              R/B No. 1   Relay
  1                       1                            2         3
                                                                               M1
       1                                           1         1                 Mass Air Flow Meter
                                                                                                      2
B-L                                                                                              P            VG
       F6 2                                                                                           E6
                                                       B-Y                                    3
                   Fusible                                                4    B-Y                    10
                   Link Block                W-B                                                 V            EVG
            MAIN                                                         EB1                          E6
                                                                                     1       2

               Battery
                                                  EC

      A09136                                                                                                              A14310




INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc.
at the time of the malfunction.

   1           Connect OBD II scan tool or TOYOTA hand-held tester, and read value of mass
               air flow rate.

PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and push the OBD II scan tool or TOYOTA hand-held tester main switch ON.
(c) Start the engine.
CHECK:
Read mass air flow rate on the OBD II scan tool or TOYOTA hand-held tester.




 2002 ECHO (RM884U)

                                                                                Author :             Date :               193
DI-24
                                              DIAGNOSTICS      -   ENGINE

RESULT:
                                                        Type I                                Type II
          Mass air flow rate (gm/sec.)                   0.0                               271.0 or more


                                                     Type I        Go to step 2.


                                                    Type II        Go to step 5.



    2         Check voltage of mass air flow meter power source.

                                                    PREPARATION:
              ON                                    (a) Disconnect the mass air flow meter connector.
                                                    (b) Turn ignition switch ON.
                                                    CHECK:
                     3 (+)                          Measure voltage between terminal 4 of mass air flow meter con-
                                                    nector and body ground.
                                                    OK:
                                                         Voltage: 9 - 14 V
 BE6653
 A01589                                    A01588

                                                      NG           Check for open in harness and connector
                                                                   between EFI main relay (Marking: EFI) and
                                                                   mass air flow meter (See page IN-29 ).


   OK




    3         Check voltage between terminal VG of ECM connector and body ground.

                                                    PREPARATION:
             START                                  (a) Remove the connector cover from the ECM.
                                  VG (+)
                                                    (b) Start the engine.
                                                    CHECK:
                                                    Measure voltage between terminal VG of ECM and body
                                                    ground while engine is idling.
                                                    OK:
                                                         Voltage:
 BE6653 P23805                             A09417        1.1 - 1.5 V (P or N position and A/C switch OFF)


                                                      OK           Check and replace ECM (See page IN-29 ).


   NG


2002 ECHO (RM884U)

                                                                            Author :       Date :              194
                                                                                               DI-25
                                   DIAGNOSTICS   -   ENGINE



  4     Check for open and short in harness and connector between mass air flow meter
        and ECM (See page IN-29 ).


                                           NG        Repair or replace harness or connector.


  OK



 Replace mass air flow meter.




  5     Check continuity between terminal EVG of ECM connector and body ground.

                EVG
                                         PREPARATION:
                                         Remove the connector cover from the ECM.
                                         CHECK:
                                         Check continuity between terminal EVG of ECM connector and
                                         body ground.
                                         OK:
                                              Continuity (1  or less)

                                A09033



                                           NG        Check and replace ECM (See page IN-29 ).


  OK



  6     Check for open in harness and connector between mass air flow meter and ECM
        (See page IN-29 ).


                                           NG        Repair or replace harness or connector.


  OK



 Replace mass air flow meter.




2002 ECHO (RM884U)

                                                          Author :          Date :              195



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